Piezoelectric transformer



FIG. 1 is a front elevation view of a piezoelectric transformer showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation view thereof; and,

FIG. 6 is a left side elevation view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

We claim an ornamental design for the piezoelectric transformer, as shown and described. 